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GPU-ASIFT: A fast fully affine-invariant feature extraction algorithm

GPU-ASIFT: A fast fully affine-invariant feature extraction ...

引用

International Conference on High Performance Computing & Simulation (HPCS)

作者： Valeriu Codreanu Feng Dong Baoquan Liu Jos B.T.M. Roerdink David Williams Po Yang Burhan Yasar Scientific Visualization and Computer Graphics Groningen Netherlands Scientific Visualization and Computer Graphics Rijksuniversiteit Groningen Groningen The Netherlands Department of Computer Science and Technology University of Bedfordshire Bedfordshire UK Rotasoft Inc. Turkey

This paper presents a method that takes advantage of powerful graphics hardware to obtain fully affine-invariant image feature detection and matching. The chosen approach is the accurate, but also very computationally expensive, ASIFT algorithm. We have created a CUDA version of this algorithm that is up to 70 times faster than the original implementation, while keeping the algorithm's accuracy close to that of ASIFT. It's matching performance is therefore much better than that of other non-fully affine-invariant algorithms. Also, this approach was adapted to fit the multi-GPU paradigm in order to assess the acceleration potential from modern GPU clusters.

关键词： graphics processing units Feature extraction Kernel Mathematical model Instruction sets Hardware Accuracy

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Low-cost automatic inpainting for artifact suppression in facial images

Low-cost automatic inpainting for artifact suppression in fa...

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8th International Conference on computer Vision Theory and Applications, VISAPP 2013

作者： Sobiecki, André Telea, Alexandru Giraldi, Gilson Neves, Luiz Antonio Pereira Thomaz, Carlos Eduardo Scientific Visualization and Computer Graphics University of Groningen Nijenborgh 9 Groningen Netherlands Department of Computing National Laboratory of Scientific Computation Petŕopolis Brazil Department of Computing Parańa Federal University Curitiba Brazil Department of Artificial Intelligence Applied on Automation University Center of FEI Sao Bernardo do Campo Brazil

ISBN: (纸本)9789898565471

Facial images are often used in applications that need to recognize or identify persons. Many existing facial recognition tools have limitations with respect to facial image quality attributes such as resolution, face position, and artifacts present in the image. In this paper we describe a new low-cost framework for preprocessing low-quality facial images in order to render them suitable for automatic recognition. For this, we first detect artifacts based on the statistical difference between the target image and a set of pre-processed images in the database. Next, we eliminate artifacts by an inpainting method which combines information from the target image and similar images in our database. Our method has low computational cost and is simple to implement, which makes it attractive for usage in low-budget environments. We illustrate our method on several images taken from public surveillance databases, and compare our results with existing inpainting techniques.

关键词： Database systems

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From imprecise user input to precise vessel segmentations

From imprecise user input to precise vessel segmentations

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3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Diepenbrock, S. Ropinski, T. Visualization and Computer Graphics Group University of Münster Germany Scientific Visualization Group Linköping University Sweden

ISBN: (纸本)9783905674385

Vessel segmentation is an important prerequisite for many medical applications. While automatic vessel segmentation is an active field of research, interaction and visualization techniques for semi-automatic solutions have gotten far less attention. Nevertheless, since automatic techniques do not generally achieve perfect results, interaction is necessary. Especially for tasks that require an in-detail inspection or analysis of the shape of vascular structures precise segmentations are essential. However, in many cases these can only be generated by incorporating expert knowledge. In this paper we propose a visual vessel segmentation system that allows the user to interactively generate vessel segmentations. Therefore, we employ multiple linked views which allow to assess different aspects of the segmentation and depict its different quality metrics. Based on these quality metrics, the user is guided, can assess the segmentation quality in detail and modify the segmentation accordingly. One common modification is the editing of branches, for which we propose a semi-automatic sketch-based interaction metaphor. Additionally, the user can also influence the shape of the vessel wall or the centerline through sketching. To assess the value of our system we discuss feedback from medical experts and have performed a thorough evaluation. © The Eurographics Association 2012.

关键词： Medical applications

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Importance-Driven Particle Techniques for Flow visualization

Importance-Driven Particle Techniques for Flow Visualization

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Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Kai Burger Polina Kondratieva Jens Kruger Rudiger Westermann Computer Graphics and Visualization Group Technische Universität München Computer Graphics and Visualization Group Technische Universität München Germany Scientific Computing and Imaging Institute University of Utah USA

Particle tracing has been established as a powerful visualization technique to show the dynamics of 3D flows. Particle tracing in 3D, however, quickly overextends the viewer due to the massive amount of visual information that is typically produced by this technique. In this paper, we present strategies to reduce this amount at the same time revealing important structures in the flow. As an importance measure, we introduce a simple, yet effective clustering approach for vector fields, and we use scalar flow quantities at different scales in combination with user-defined regions of interest. These measures are used to control the shape, the appearance, and the density of particles in such a way that the user can focus on the dynamics in important regions at the same time preserving context information. We also introduce a new focus for particle tracing, so called anchor lines. Anchor lines are used to analyze local flow features by visualizing how much particles separate over time and how long it takes until they have separated to a fixed distance. It is of particular interest if the finite time Lyapunov exponent - a scalar quantity that measures the rate of separation of infinitesimally close particles in the flow - is used to guide the placement of anchor lines. The effectiveness of our approaches for the visualization of 3D flow fields is validated using synthetic fields as well as real simulation data.

关键词： Data visualization computer graphics Particle measurements Shape measurement Time measurement Shape control Rendering (computer graphics) scientific computing Density measurement Focusing

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SKETCH: An interface for sketching 3d scenes

SKETCH: An interface for sketching 3d scenes

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ACM SIGGRAPH 2007 - International Conference on computer graphics and Interactive Techniques

作者： Zeleznik, Robert C. Herndon, Kenneth P. Hughes, John F. Brown University NSF Science and Technology Center for Computer Graphics and Scientific Visualization PO Box 1910 Providence RI 02912 United States

Sketching communicates ideas rapidly through approximate visual images with low overhead (pencil and paper), no need for precision or specialized knowledge, and ease of low-level correction and revision. In contrast, most 3D computer modeling systems are good at generating arbitrary views of precise 3D models and support high-level editing andrevision. The SKETCH application described in this paper attempts to combine the advantages of each in order to create an environment for rapidly conceptualizing and editing approximate 3D scenes. To achieve this, SKETCH uses simple non-photorealistic rendering and a purely gestural interface based on simplified line drawings of primitives that allows all operations to be specified within the 3D world.

关键词： Three dimensional computer graphics

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SKETCH: An interface for sketching 3D scenes 06

SKETCH: An interface for sketching 3D scenes

引用

2006 ACM SIGGRAPH Courses, SIGGRAPH 2006

作者： Zeleznik, Robert C. Herndon, Kenneth P. Hughes, John F. NSF Science and Technology Center for Computer Graphics and Scientific Visualization PO Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)1595933646

Sketching communicates ideas rapidly through approximate visual images with low overhead (pencil and paper), no need for precision or specialized knowledge, and ease of low-level correction and revision. In contrast, most 3D computer modeling systems are good at generating arbitrary views of precise 3D models and support high-level editing and revision. The SKETCH application described in this paper attempts to combine the advantages of each in order to create an environment for rapidly conceptualizing and editing approximate 3D scenes. To achieve this, SKETCH uses simple non-photorealistic rendering and a purely gestural interface based on simplified line drawings of primitives that allows all operations to be specified within the 3D world.

关键词： Three dimensional computer graphics

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Topology- and Feature-based Flow visualization: Methods and Applications 1

Topology- and Feature-based Flow Visualization: Methods and ...

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1st Workshop of the DFG's International Research Training Group "visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling, and Engineering"

作者： Garth, Christoph Tricoche, Xavier Computer Graphics & Visualization Group University of Kaiserslautern Kaiserslautern Germany Scientific Computing & Imaging Insitute University of Utah Salt Lake CityUT United States

ISBN: (纸本)9783885794387

In this paper we give a survey on topology- and feature-based flow visualization methods. After an introduction into the respective methodologies and a basic classification of techniques, we will focus on practical aspects and several application examples from different areas of flow physics. We show the utility and importance of these classes of tools in the design and analysis of technical flows. © 2006 Gesellschaft für Informatik, Bonn.

关键词： Flow visualization

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Noise cancellation frontends for automatic meeting transcription

Noise cancellation frontends for automatic meeting transcrip...

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6th European Conference on Noise Control: Advanced Solutions for Noise Control, EURONOISE 2006

作者： Képesi, Marián Van Pham, Tuan Kubin, Gernot Weruaga, Luis Juffinger, Andreas Grabner, Michael Signal Processing and Speech Communication Laboratory Graz University of Technology Inffeldgasse 8010 Graz Austria Commission for Scientific Visualization Austrian Academy of Sciences Donau-City Strasse 1 Vienna Austria Institute for Theoretical Computer Science Graz University of Technology Inffeldgasse 8010 Graz Austria Institute for Computer Graphics Graz University of Technology Inffeldgasse 8010 Graz Austria

One research direction to make computers become more active machines is to use audio input with far-field omni-directional microphones, these being required to face the acoustics problem of the meeting scenario. This topic is not only interesting from an artificial listener point-of-view, but also as one of the hottest topics in searchable media. In this paper two noise suppression methods for real meeting audio are evaluated. Because of the usage of hands-free microphones in a meeting environment, the reverberation of meeting rooms and background noise sources such as projector, computer fan have huge impact on speech quality. Two denoising methods, based on statistical Wavelet filtration and short-time Fourier transform are discussed and evaluated. Whilst the quantile technique is suitable for estimating stationary noise (beamer, computer fan), non-stationary sources (closing door, chair movement) can be handled by recursive structure and adaptive temporal gain of the statistical filtration method. Besides, frequency non-linear gain can remove colored noise effectively. The proposed noise reduction methods are evaluated with speaker localizing application applied on the meeting database of the Mistral project. The results show the pros and cons of each method applied on the meeting database.

关键词： Microphones

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Real-time 3D graphics systems: From simulators to virtual studios

Real-time 3D graphics systems: From simulators to virtual st...

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15th International Conference on computer graphics and Vision, GraphiCon 2005

作者： Dolgovesov, Boris S. Mazurok, Boris S. Shevtsov, Maxim U. V.rukhlinskiy, Alexey Morozov, Boris B. Fomichev, Vladimir M. V.pekarskiy, Alexandr Naumov, B.A. Laboratory of Synthesizing Visualization Systems Institute of Automation and Electrometry Russia Novosibirsk State University Russia Institute of Automation and Electrometry Russia Computer Graphics Laboratory Department of IAE Russia Institute of Microprocessor Computer Systems RAS Nakhimovsky prospect 36/1 Moscow GSP-7 117997 Russia Cosmonaut Training Yu. A. Gagarin Russian State Scientific-Research and Test Centre of Russia Administrative Department Cosmonaut Training Yu. A. Gagarin Russian State Scientific-Research and Test Centre Russia

The paper deal with 3D graphics simulators history. Several generation of space simulators that were used in training centers including Yu. A. Gagarin Russian State scientific-Research and Test Centre of Cosmonaut Training (Moscow, Russia) are discussed. Number of US-Russia international space station programs use these cosmonaut training system in order to increase the efficiency of crews' space activities, and to ensure safe manned flights. Today we introduce powerful PC-based solution for Virtual Studio. Formal requirements for such a system are declared and its distributed architecture implementation is briefly outlined.

关键词： Simulators

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Skin: A constructive approach to modeling free-form shapes 99

Skin: A constructive approach to modeling free-form shapes

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26th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1999

作者： Markosian, Lee Cohen, Jonathan M. Crulli, Thomas Hughes, John Brown University Site of the NSF Technology Center for Computer Graphics and Scientific Visualization Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)0201485605

We present a new particle-based surface representation with which a user can interactively sculpt free-form surfaces. The particles maintain mesh connectivity and operate under rules that lead them to form triangulations with properties that make them suitable for use in subdivision. A user interactively guides the particles, which we call skin, to grow over a given collection of polyhedral elements (or skeletons), yielding a smooth surface (through subdivision) that approximates the underlying skeletal shapes. Skin resembles blobby modeling in the constructive approach to modeling it supports, but allows a richer vocabulary of skeleton shapes, supports sharp creases where desired, and provides a convenient mechanism for adding multiresolution surface detail. Copyright ACM 1999.

关键词： Musculoskeletal system

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